On the right is a Triphyllozoon sp. colony. They are found in Australian water. In this particular colony there are over 5 000 000 individuals.

Below is Adeona sp., also found in Australian water.

These are also known as moss animals, polyzoa and ectoprocts. They usually occur in colonies in the shallows, and are often mistaken for algae or sponges. Individuals are minute, usually measuring less than 0.5 mm long (see Bowerbankia sp). right. There are about 4300 described species, and they have no fossil record until the Ordovician. The eggs or statoblasts of some freshwater species can withstand freezing and desiccation, and usually germinate in the spring. A freshwater bryozoan colony can be up to 5 cm long. They are usually found in clear ponds and lakes on the undersides of water-lily leaves or the upper surfaces of stones. A colony can move about 10 cm a day. On the left are some individuals of Crisatella mucedo a freshwater bryozoan.